Sure it's dead.
4 seconds sound clip from the Superman (1978) movie soundboard.
You can hear this line at 02:56:12 in the Blu-ray version of the movie.
Quote context
[...]
- One thing I do know, son, and that is you are here for a reason.
- Those things I can do, all those powers, and I couldn't even save him.
- Hi. Don't bother, I think it's dead.
- The problem with men of steel, there's never one around when you want one.
- I'm almost killed, and to top the whole thing off, this stupid car runs out of gas!
- I'm sorry about that, Lois, but I've been kind of busy for a while.
[...]